What does 13 mean to a biker?

What does 13 mean to a biker?

The letter M, being the 13th letter of the alphabet, often is said to stand for marijuana or motorcycle. Generally, it is assumed someone wearing a 13 patch is either a user of marijuana or other drugs, or is involved with the sale of them. The M also has been known to stand for “”methamphetamine””. Jul 29, 2016

See also  Can anyone else drive my car?